JP2007240910A - Electrooptical device and electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrooptical device which is improved in color reproducibility of one of two display panels and so on by changing lighting methods of the two display panels according to the kind of a light source of a lighting device. <P>SOLUTION: A liquid crystal display device is used for a both-surface display type mobile phone etc., and has a lighting device having a light guide plate and a light source part, a first liquid crystal display panel having colored layers of four colors disposed on one surface side and a second liquid crystal display panel having colored layers of three colors disposed on the other surface side. The light source part has an RGB LED emitting white light and a white LED which contains a YAG-based phosphor and emits white light. The first liquid crystal display panel corresponds to a main display panel and is lit by using at least the RGB LED, which is not turned ON when the second liquid crystal display panel is lit. Display of high color reproducibility is therefore obtained and while deterioration of the RGB LED with time is delayed, the electric power of the light source part can be saved. The second liquid crystal display panel corresponds to a subordinate display panel and is lit by using the white LED. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electro-optical device suitable for use in displaying various information.

  Conventionally, various electro-optical devices such as a liquid crystal device, an organic electroluminescence display device, a plasma display device, and a field emission display device are known. A liquid crystal device as an example of such an electro-optical device is suitably used as a display device such as a so-called double-sided display mobile phone.

  For example, in a foldable double-sided display type mobile phone, a display unit (corresponding to the lid side in terms of structure) is generally attached so that it can be folded in a hinged manner with respect to a main body unit provided with operation buttons and the like. A large liquid crystal display panel is provided on the inner side (side facing the operation button) of the display unit, and a small liquid crystal display panel is provided on the outer side (back side) of the display unit. That is, a large liquid crystal display panel and a small liquid crystal display panel are provided back to back. One backlight unit is provided between two liquid crystal display panels arranged back to back (see, for example, Patent Document 1).

  By adopting such a configuration, consumption is achieved by using one light emitting surface of one backlight unit for lighting a large liquid crystal display panel and using the other light emitting surface for lighting a small liquid crystal display panel. It is possible to reduce electric power, reduce the thickness of the device itself, reduce costs, and the like.

JP 2004-151342 A

  In the above-mentioned double-sided display type cellular phone and the like, generally, a large liquid crystal display panel is used as a main display panel for displaying various kinds of information, while a small liquid crystal display panel is used for displaying the remaining battery level and radio waves. It is used as a sub display panel for simple display of the situation.

  Therefore, for example, in a double-sided display type cellular phone capable of color display, a high display quality is not required for the sub display panel, but a display quality with high color reproducibility is required for the main display panel. . Therefore, if the two display panels are illuminated according to the type of light source of the illumination device, it can be expected that the power consumption can be reduced while satisfying the above requirements.

  The present invention has been made in view of the above points, and is suitably mounted on an electronic device such as a double-sided display type mobile phone, and changes the illumination method of the two display panels according to the type of light source of the illumination device. Accordingly, an object of the present invention is to provide an electro-optical device or the like that can improve the color reproducibility of at least one of the two display panels.

  In one aspect of the present invention, the electro-optical device includes a light guide plate and a plurality of light sources, and the lighting device in which the first light source among the plurality of light sources can be controlled to be turned on independently of the second light source; A first display panel having a first color filter disposed on one surface side of the lighting device and including a colored region of at least four hues in the first unit pixel, and the other surface side of the lighting device And a second display panel having a second color filter including a colored region of at least three hues in the second unit pixel, wherein the first light source is the second display Does not light up when illuminating the panel.

  The electro-optical device includes a plurality of light sources, a light guide plate that emits light from the light sources to the outside, and an illumination device in which the first light source among the plurality of light sources can be controlled to be turned on independently of the second light source. A first display panel having a first color filter disposed on one surface side of the lighting device and including a colored region of at least four hues in the first unit pixel, and the other of the lighting device And a second display panel having a second color filter that is disposed on the surface side and includes a colored region of at least three hues in the second unit pixel. Therefore, it is possible to illuminate two display panels with one illumination device, and it is possible to reduce the cost and thickness of the electro-optical device.

  In addition, since the first display panel includes the first color filter including the colored region of at least four colors in the first unit pixel, the colored region of the three colors in the first unit pixel. Compared with a display panel having a color filter, a display with higher color reproducibility can be obtained. For this reason, the first display panel can be suitably used as a main display panel in, for example, an electronic device such as a double-sided display type mobile phone. On the other hand, the second display panel has a second color filter including a colored region of at least three hues in the second unit pixel, so that the color reproducibility is not so high as compared with the first display panel. . Therefore, the second display panel can be suitably used as a sub display panel that displays simple display information such as time, remaining battery level, and radio wave status in electronic devices such as a double-sided display mobile phone. .

Moreover, in this illuminating device, it is comprised so that lighting control of the 1st light source among several light sources is possible independently of a 2nd light source. Therefore, when illuminating a plurality of illumination objects by the illumination device or when illuminating in a different manner, the first light source among the plurality of light sources can be turned on / off independently of the second light source. Therefore, unnecessary lighting can be prevented and power consumption can be reduced. In particular, in this illumination device, the first light source is not turned on when the second display panel is illuminated. As a result, it is possible to save power in the light source unit while delaying deterioration with time of the first light source.
In a preferred example, the first color filter has a blue hue coloring area, a red hue coloring area, or a hue of blue to yellow in a visible light area whose hue changes according to a wavelength. It is preferable to have colored regions of two hues selected among them. In the first color filter, the wavelength peak of light transmitted through the colored region is a first colored region having a wavelength of 415 to 500 nm, a second colored region having a wavelength of 600 nm or more, and a third having a peak of 485 to 535 nm. It is preferable to have a colored region and a fourth colored region at 500 to 590 nm.

  In one aspect of the electro-optical device, the plurality of light sources emit white light, the first light source emits red light, a first semiconductor light emitting element, and green light emits second light. The semiconductor light emitting device includes a semiconductor light emitting device and a third semiconductor light emitting device that emits blue light, and the second light source emits light from the fourth semiconductor light emitting device that emits blue light and the fourth semiconductor light emitting device. It has a phosphor that emits yellow light when irradiated with blue light.

  In this aspect, the plurality of light sources emit white light. The first light source is a so-called RGB light source, and includes a first semiconductor light emitting element that emits red light, a second semiconductor light emitting element that emits green light, and a third semiconductor light emitting element that emits blue light. Therefore, by causing each of the first semiconductor light emitting element, the second semiconductor light emitting element, and the third semiconductor light emitting element to emit light, white light can be obtained by mixing red light, green light, and blue light. . Note that the first light source may be configured so that each of the first semiconductor light emitting element, the second semiconductor light emitting element, and the third semiconductor light emitting element emits light independently. On the other hand, the second light source includes a fourth semiconductor light emitting element that emits blue light, and a phosphor that emits yellow light when irradiated with the blue light emitted from the fourth semiconductor light emitting element. In a preferred example, the second light source is preferably composed of a blue LED that emits blue light and a YAG (yttrium, aluminum, garnet) phosphor. Here, the blue light emitted from the fourth semiconductor light emitting element excites the phosphor to generate yellow light. Therefore, the light emitted from the second light source is white light in which blue light and yellow light generated by exciting the phosphor with the blue light are mixed.

  In another aspect of the electro-optical device, the illumination device controls lighting of the light source in a first mode in which all of the plurality of light sources are turned on and a second mode in which only the second light source is turned on. A control unit is provided.

  In this aspect, in the first mode, all light sources are turned on to illuminate a wide area, or brighter illumination is performed, and in the second mode, only the second light source is lit to illuminate a narrow area. Alternatively, lighting with reduced brightness can be performed. Thereby, the light source is not turned on unnecessarily, and power consumption can be reduced.

  In another aspect of the electro-optical device, the control unit performs lighting control of the light source in the first mode when illuminating the first display panel, and illuminates the second display panel. Sometimes the lighting control of the light source is performed in the second mode.

  In this aspect, the controller performs lighting control of the light source in the first mode when illuminating the first display panel. Therefore, for example, by illuminating the first display panel by turning on all of the plurality of light sources including the first light source and the second light source that are RGB light sources in the first mode, light is emitted from the first light source. Red light, green light, and blue light are transmitted through the first color filter including the four colored regions of the first display panel, so that a display with higher color reproducibility can be obtained and the first The brightness of the display panel can be increased.

  The control unit performs lighting control of the light source in the second mode when illuminating the second display panel. Therefore, for example, by illuminating the second display panel by turning on only the second light source among the plurality of light sources in the second mode, the following effects can be obtained.

  That is, in the RGB light source, the spectrum of light emitted from each of the first semiconductor light emitting element that emits red light, the second semiconductor light emitting element that emits green light, and the third semiconductor light emitting element that emits blue light. (Luminance) has the property of changing with time. For this reason, the white balance of the emitted light gradually deteriorates from the initial setting state, and naturally, the white balance at the time of display on the first display panel also deteriorates. As a result, the first display panel cannot be used as a main display panel that requires display with high color reproducibility. Therefore, in the case of using the second display panel, in order to prevent the consumption of the RGB light source due to the change with time as much as possible and maintain a good white balance at the time of initial setting of the first display panel over a long period of time, The control unit illuminates the second display panel by turning on only the second light source without using the first light source as the RGB light source in the second mode. Accordingly, it is possible to prevent as much as possible the consumption of the first light source as the RGB light source due to the change over time, and it is possible to maintain a good white balance at the time of initial setting of the first display panel over a long period of time.

  Further, as described above, when only the second light source among the plurality of light sources is turned on in the second mode to illuminate the second display panel, the illumination light becomes white light with a large amount of blue light components. . That is, the light that illuminates the second display panel may be bluish white light.

  Therefore, in order to prevent the occurrence of such a problem, as another aspect, in addition to turning on the second light source in the second mode, the first semiconductor that emits red light out of the first light source. Only the second light emitting element and the second semiconductor light emitting element emitting green light are turned on to illuminate the second display panel, whereby red light is emitted from the first semiconductor light emitting element, and the second semiconductor The light emitting element emits green light, and the second light source emits white light containing a large amount of blue light. Each of the lights is mixed, and the mixed white light is converted into pure white light. By approaching, that is, red light and green light are mixed with white light having a large amount of blue light component, white light with less coloring is corrected. As a result, the lighting device can illuminate the second display panel using white light without coloring.

  In addition, since the green light emitted by the second semiconductor light emitting element is bright, the first to third semiconductors have a role of increasing the overall luminance of the illumination light and emit red light, green light, and blue light, respectively. Among the light-emitting elements, the first semiconductor light-emitting element that emits red light has the property of being most rapidly deteriorated with time. Therefore, in consideration of this point, when illuminating the second display panel, as another aspect, in addition to turning on the second light source in the second mode, the green light of the first light source is emitted. By illuminating the second display panel by turning on only the second semiconductor light emitting element that emits light, green light is emitted from the second semiconductor light emitting element, and there is much blue light component from the second light source. White light is emitted, the respective lights are mixed, and the mixed white light is corrected to white light with little coloration. In addition, this can delay the deterioration with time of the first semiconductor light emitting element that emits red light, and can increase the luminance of the illumination light that illuminates the second display panel.

  In another aspect of the electro-optical device, the plurality of light sources includes an auxiliary light source disposed on the other end surface of the light guide plate on which the plurality of light source units are disposed, and the control unit includes And a third mode in which only the second light source and the auxiliary light source are turned on.

  In this aspect, in addition to the plurality of light sources arranged along one end surface of the light guide plate, an auxiliary light source is provided on the other end surface facing the light source plate. Therefore, for example, in a situation where the brightness in the illumination in the second mode is insufficient, it is possible to supplement the brightness by turning on the second light source and the auxiliary light source as the third mode. Become.

  In another aspect of the invention, an electronic apparatus including the above-described electro-optical device in a display portion can be configured. Also, in a preferred embodiment in that case, the electronic device is a foldable mobile phone provided with a main body and the display, and the first display panel when the main body and the display are folded. Is located on the surface of the display portion on the main body portion side, and the second display panel is located on the surface of the display portion opposite to the main body portion. As a result, when the first display panel, which is generally the main panel, is used, it is possible to illuminate the whole using all the light sources, while the second display panel, which is generally the sub panel, is used. In this case, only a part of the light source can be efficiently illuminated using only a part of the light sources. As a result, the light source is not turned on unnecessarily when the sub panel is used, and the power consumption can be reduced.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is a cross-sectional view showing a schematic configuration of a liquid crystal device 100 to which the illumination device 1 according to the first embodiment of the present invention is applied. In FIG. 1, the vertical direction (normal direction) of the paper surface is defined as the Z direction, the horizontal direction of the paper surface is defined as the X direction, and the front side of the paper surface is defined as the Y direction. Further, in FIG. 1, for convenience of explanation, each component is illustrated with a space therebetween, but actually, the liquid crystal device 100 is configured in a state where they are overlapped in the Z direction in the drawing.

  The liquid crystal device 100 includes a single lighting device 1 including a light source unit 15 and a light guide plate 10, a first liquid crystal panel 20 disposed on one surface side (upper surface side) of the lighting device 1, And the second liquid crystal display panel 30 disposed on the other surface side (lower surface side) of the lighting device 1, and is suitably used for an electronic device such as a so-called double-sided display type mobile phone. The detailed configuration of the lighting device 1 will be described later.

  As shown in FIG. 6A, the light source unit 15 includes a plurality of LEDs (Light Emitting Diodes) 16 which are semiconductor light emitting elements. The light L1 emitted from each LED 16 enters the light guide plate 10 through the light incident end surface 10a of the light guide plate 10 as shown in the figure, and is transmitted through the upper and lower surfaces of the light guide plate 10, that is, the first light output surface 10b and the second light output surface 10c. The direction is changed by repeating the reflection, and the light is transmitted through the first light output surface 10b and the second light output surface 10c of the light guide plate 10 and emitted to the outside as light L2 and L3.

  The first liquid crystal display panel 20 corresponds to a main display panel for displaying characters, figures, images, etc. in a double-sided display type mobile phone or the like, and R (red), B (blue), G1 (green 1), G2 (green 2) is provided with four colored areas. For this reason, the first liquid crystal display panel 20 can express four or more colors. In addition, this invention is not limited to said structure, In order to improve color reproducibility further, the 1st liquid crystal display panel 20 may be provided with the colored area | region of 5 colors or more. The first liquid crystal display panel 20 is formed by bonding a pair of element substrates 21 and a color filter substrate 22 via a frame-shaped sealing material 3 and encapsulating liquid crystals therein to form a liquid crystal layer 4. A detailed description of the structure will be given later.

  On the other hand, the second liquid crystal display panel 30 is a panel that is smaller than the first liquid crystal display panel 20 and has a smaller display area than the first liquid crystal display panel 20. The second liquid crystal display panel 30 is a sub-display panel (a small display panel provided on the back of the main display panel) that performs simple display of time, remaining battery power, radio wave status, etc. in a double-sided display mobile phone or the like. And has three colored regions of R (red), G (green), and B (blue). For this reason, the second liquid crystal display panel 30 can express three or more colors. In addition, this invention is not limited to said structure, In order to improve color reproducibility further, the 2nd liquid crystal display panel 30 may be provided with the coloring area | region of 3 or more colors. The second liquid crystal display panel 30 is also formed by laminating a pair of element substrate 31 and color filter substrate 32 via a frame-shaped sealing material 3 and encapsulating liquid crystal therein to form a liquid crystal layer 4. A detailed description of the structure will be given later.

  In the liquid crystal device 100, a diffusion sheet 11, a first prism sheet 12, a second prism sheet 13, and a light shielding sheet 14 are provided between the lighting device 1 and the first liquid crystal display panel 20. .

  The diffusion sheet 11 is provided on the side of the light guide plate 10 facing the first light exit surface 10b, and diffuses the light L2 transmitted through the first light exit surface 10b toward the first prism sheet 12 to emit light from the lighting device 1. It has the role of making the in-plane brightness uniform. The first prism sheet 12 is provided on the side facing the diffusion sheet 11, has a plurality of prisms 12x having a triangular cross section on the upper surface side, and has a shape in which each prism 12x extends in the Y direction. . With this structure, the first prism sheet 12 has a role of condensing the light L2 transmitted through the diffusion sheet 11 on the second prism sheet 13 side. The second prism sheet 13 is provided on the side facing the first prism sheet 12, has a plurality of prisms 13x having a triangular cross section on the upper surface side, and each prism 13x extends in the X direction. Has a shape. With this structure, the second prism sheet 13 transmits the P-wave component of the light transmitted through the first prism sheet 12 and reflects the S-wave component light to the first prism sheet 12 side. And has the role of condensing the light L2 on the first liquid crystal display panel 20 side. In particular, in this example, the extending direction of the ridge line of each prism 13 x of the second prism sheet 13 is set to be substantially orthogonal to the extending direction of the ridge line of each prism 12 x of the first prism sheet 12. Therefore, the light collection efficiency of the light L2 emitted from the light guide plate 10 side can be improved by the prism sheets. The light shielding sheet 14 is, for example, a light shielding tape, and is provided between the first liquid crystal display panel 20 and the second prism sheet 13 at least on the light source unit 15 side and the opposite side. The light shielding sheet 14 prevents unwanted light emitted from the lighting device 1 side from entering the first liquid crystal display panel 20 side, and adversely affects the display quality of the first liquid crystal display panel 20. It has a role to prevent.

  On the other hand, a diffusion sheet 17, a first prism sheet 18, a second prism sheet 19, and a light shielding sheet 14 are provided between the lighting device 1 and the second liquid crystal display panel 30.

  The diffusion sheet 17 is provided on the side facing the second light exit surface 10c of the light guide plate 10, and diffuses the light L3 transmitted through the second light exit surface 10c toward the first prism sheet 18 to emit light from the lighting device 1. It has the role of making the in-plane brightness uniform. The first prism sheet 18 is provided on the side facing the diffusion sheet 17, has a plurality of prisms 18 x having a triangular cross section on the upper surface side, and has a shape in which each prism 18 x extends in the Y direction. . With this structure, the first prism sheet 18 has a role of condensing the light L3 transmitted through the diffusion sheet 17 on the second prism sheet 19 side. The second prism sheet 19 is provided on the side facing the first prism sheet 18, has a plurality of prisms 19x having a triangular cross section on the upper surface side, and each prism 19x extends in the X direction. Has a shape. With this structure, the second prism sheet 19 has a role of condensing the light L3 transmitted through the first prism sheet 18 on the second liquid crystal display panel 30 side. In particular, in this example, the extending direction of the ridge line of each prism 19 x of the second prism sheet 19 is set to be substantially orthogonal to the extending direction of the ridge line of each prism 18 x of the first prism sheet 18. Therefore, the light collection efficiency of the light L3 emitted from the light guide plate 10 side can be improved by the prism sheets. The light shielding sheet 14 is provided between the second liquid crystal display panel 30 and the second prism sheet 19 at least on the light source unit 15 side and on the opposite side. The light shielding sheet 14 prevents unwanted light emitted from the lighting device 1 side from entering the second liquid crystal display panel 30 side, and adversely affects the display quality of the second liquid crystal display panel 30. It has a role to prevent.

  In the liquid crystal device 100 having the above configuration, the light L1 emitted from each LED 16 in the light source unit 15 enters the light guide plate 10 through the light incident end face 10a of the light guide plate 10 as shown in FIG. The light L1 that has entered the light guide plate 10 is located on the first liquid crystal display panel 20 side, the first light exit surface 10b of the light guide plate 10, and the second liquid crystal display panel 30 side. By repeating the reflection with the second light exit surface 10c, the light guide plate 10 propagates in the X direction opposite to the light incident end surface 10a. The light L1 propagating through the light guide plate 10 passes through the first light exit surface 10b and exits toward the diffusion sheet 11 when the angle formed by the first light exit surface 10b exceeds the critical angle. On the other hand, the light L1 propagating in the light guide plate 10 passes through the second light exit surface 10c and exits toward the diffusion sheet 17 when the angle formed with the second light exit surface 10c exceeds the critical angle.

  Here, the light emitted to the diffusion sheet 11 side diffuses to the first prism sheet 12 side by passing through the diffusion sheet 11. Then, a part of the diffused light is refracted by the inclined surface of each prism 12x of the first prism sheet 12, and the traveling direction is changed, and the second light is collected as the condensed light L2 having directivity in the normal direction. The light exits to the prism sheet 13 side. Then, the light L2 emitted to the second prism sheet 13 side is condensed in the normal direction by the action of each prism 13x of the second prism sheet 13, and is emitted to the first liquid crystal display panel 20 side. Thereby, the 1st liquid crystal display panel 20 can display images, such as a character, a number, and a figure, and an observer can visually recognize an image.

  On the other hand, the light emitted to the diffusion sheet 17 side diffuses to the first prism sheet 18 side by passing through the diffusion sheet 17. A part of the diffused light is refracted by the inclined surface of each prism 18x of the first prism sheet 18 and the traveling direction is changed, and the second light is collected as the condensed light L3 having directivity in the normal direction. The light exits to the prism sheet 19 side. Then, the light L3 emitted to the second prism sheet 19 side is condensed in the normal direction by the action of each prism 19x of the second prism sheet 19, and is emitted to the second liquid crystal display panel 30 side. Thereby, the 2nd liquid crystal display panel 30 can display images, such as a character, a number, and a figure, and an observer can visually recognize an image.

(Configuration of the first liquid crystal display panel)
Next, with reference to FIGS. 2 and 3, the detailed configuration of the first liquid crystal display panel 20 will be described.

  FIG. 2 is a plan view schematically showing a schematic configuration of the first liquid crystal display panel 20 functioning as a main display panel. In FIG. 2, the color filter substrate 22 is disposed on the front side (observation side) of the paper, and the element substrate 31 is disposed on the back side of the paper (illumination device 1 side). Can be reversed. In FIG. 2, the vertical direction (column direction) in the drawing is defined as the Y direction, the horizontal direction (row direction) in the drawing is defined as the X direction, and the front direction (vertical direction) in the drawing is defined as the Z direction. In FIG. 2, regions corresponding to the respective colors R (red), B (blue), G1 (green 1), and G2 (green 2) indicate one subpixel region SG, and R, B, The 1 × 4 sub-pixel region SG corresponding to G1 and G2 represents one display region AG1 which is the minimum unit of color display. Here, G1 (green 1) and G2 (green 2) are two kinds of hues selected from hues from blue to yellow. In the present embodiment, as an example, G1 (green 1) generally indicates pure green indicated by G, and G2 (green 2) indicates yellowish green.

  FIG. 3 is an enlarged cross-sectional view corresponding to one display area AG1 along the cutting line AA ′ in the first liquid crystal display panel 20 of FIG. As shown in FIG. 3, the first liquid crystal display panel 20 includes an element substrate 31 and a color filter substrate 22 disposed so as to face the element substrate 31 and are bonded to each other with a frame-shaped sealing material 3 interposed therebetween. A liquid crystal layer 4 is formed by sealing liquid crystal in a region partitioned by the sealing material 3.

  The first liquid crystal display panel 20 according to the present embodiment corresponds to a main display panel for an electronic apparatus such as a double-sided display type mobile phone. The first liquid crystal display panel 20 is a transmissive liquid crystal display panel for color display configured using four colors of R, B, G1, and G2, and an α-Si TFT as an example of a switching element. This is an active matrix drive type liquid crystal display panel using a (Thin Film Transistor) element.

  First, the configuration of the element substrate 31 will be described.

  The element substrate 31 is mainly composed of a first substrate 70 made of glass or the like, and a plurality of source lines 42, a plurality of gate lines 43, and a plurality of α-Si TFT elements formed or mounted on the first substrate 70. 47, a plurality of pixel electrodes 44, a driver IC 40, and an external connection wiring 45.

  As shown in FIG. 2, the element substrate 31 has an overhang area 41 that projects outward from one side of the color filter substrate 22, and a driver IC 40 is mounted on the overhang area 41. A terminal (not shown) on the input side of the driver IC 40 is electrically connected to one end side of the plurality of external connection wirings 45, and the other end side of the plurality of external connection wirings 45 is an FPC (Flexible Printed Circuit). ) 49 is electrically connected. Each source line 42 is formed to extend in the Y direction at an appropriate interval in the X direction, and one end side of each source line 42 is electrically connected to a terminal (not shown) on the output side of the driver IC 40. It is connected.

  Each gate line 43 extends so as to extend in the Y direction from the first wiring 43a formed in the Y direction and from the terminal portion of the first wiring 43a toward the effective display area V1 and in a direction parallel to the X direction. The second wiring 43b is formed. The second wiring 43b of each gate line 43 is formed in a direction intersecting with each source line 42, and one end side of the first wiring 43a of each gate line 43 is a terminal (not shown) on the output side of the driver IC 40. Is electrically connected. An α-Si TFT element 47 is provided at a position corresponding to the intersection of each source line 42 and each gate line 43 with the second wiring 43b, and each α-Si TFT element 47 includes each source line 42, The gate line 43 and each pixel electrode 44 are electrically connected. Each α-Si TFT element 47 and each pixel electrode 44 are provided corresponding to each sub-pixel region SG. Each pixel electrode 44 is made of a transparent conductive material such as ITO (Indium-Tin Oxide).

  A region in which a plurality of display regions AG1 are arranged in a matrix in the X direction and the Y direction is an effective display region V1 (a region surrounded by a two-dot chain line). Images such as letters, numbers, and figures are displayed in the effective display area V1. A region outside the effective display region V1 is a frame region 48 that does not contribute to display. An alignment film (not shown) is formed on the inner surfaces of the source lines 42, the gate lines 43, the α-Si TFT elements 47, the pixel electrodes 44, and the like.

  Next, the configuration of the color filter substrate 22 will be described.

  The color filter substrate 22 is mainly composed of a second substrate 71 made of glass or the like, and a light shielding layer (generally referred to as “black matrix”) formed on the second substrate 71, hereinafter simply abbreviated as “BM”. And R, B, G1, and G2 colored layers 6R, 6B, 6G1, and 6G2, and the protective layer 9 formed on the BM and colored layers 6R, 6B, 6G1, and 6G2, and the protective layer 9 and a common electrode 8 formed on the substrate 9.

  The BM is formed at a position that divides each sub-pixel region SG. Colored layers 6R, 6B, 6G1, and 6G2 are formed at positions corresponding to the sub-pixel regions SG of the colors R, B, G1, and G2, respectively. The colored layers 6R, 6G1, 6B, and 6G2 function as color filters for the respective colors. In the present invention, the arrangement order of the colored layers 6R, 6B, 6G1, and 6G2 in one display region AG1 is not limited. Further, in the following description or drawings, when a component is shown without specifying the colors of R, B, G1, and G2, it is simply written as “colored layer 6”, and R, B, G1, and G2 In the case of showing the components by distinguishing colors, for example, “colored layer 6R” is used. The common electrode 8 is made of a transparent conductive material such as ITO similarly to the pixel electrode 44, and is formed over substantially the entire surface of the color filter substrate 22. The common electrode 8 is electrically connected to one end side of the wiring 46 in the corner area E1 of the sealing material 3, and the other end side of the wiring 46 is electrically connected to the COM terminal (grounding terminal) of the driver IC 40. Connected. An alignment film (not shown) is formed on the inner surface of the common electrode 8 or the like.

In the first liquid crystal display panel 20 having the above-described configuration, G ₁ , G ₂ ,... Are driven by the driver IC 40 based on signals and power from the FPC 49 side electrically connected to an electronic device to be described later. While the gate lines 43 are selected exclusively one by one in the order of G _m−1 and G _m (m is a natural number), a gate signal of a selection voltage is supplied to the selected gate lines 43, The other non-selected gate lines 43 are supplied with a gate signal of a non-selected voltage. Then, the driver IC 40 applies source signals corresponding to display contents to the pixel electrodes 44 existing at the position corresponding to the selected gate line 43, respectively corresponding S ₁ , S _{2 ,. 1} and S _n (n is a natural number) source line 42 and α-Si type TFT element 47. As a result, the alignment state of the liquid crystal layer 4 is controlled, and the display state of the first liquid crystal display panel 20 is switched to the non-display state or the intermediate display state. Thereby, a desired image can be displayed in the effective display area V1.

  When the transmissive display is performed on the first liquid crystal display panel 20, the illumination light L2 emitted from the illumination device 1 side travels along the arrow direction in FIG. 3, and the pixel electrodes 10 and R, B, It passes through the colored layers 6 of four colors G1 and G2 and reaches the observation side. Thus, a desired color display image is visually recognized by the observer.

(Configuration of second liquid crystal display panel)
Next, with reference to FIGS. 4 and 5, the detailed configuration of the second liquid crystal display panel 30 will be described. In addition, the same code | symbol is attached | subjected about the component same as the 1st liquid crystal display panel 20, and the description is simplified.

  FIG. 4 is a plan view schematically showing a schematic configuration of the second liquid crystal display panel 30 functioning as a sub display panel. In FIG. 4, the color filter substrate 32 is arranged on the front side (observation side) of the paper, and the element substrate 31 is arranged on the back side of the paper (illumination device 1 side). Can be reversed. In FIG. 4, the vertical direction (column direction) of the paper plane is defined as the Y direction, the horizontal direction (row direction) of the paper plane is defined as the X direction, and the front side (vertical direction) of the paper plane is defined as the Z direction. In FIG. 4, the areas corresponding to the colors R (red), G (green), and B (blue) represent one sub-pixel area SG, and one row 3 corresponding to R, G, and B The sub-pixel region SG in the column indicates one display region AG2 that is a minimum unit for color display.

  FIG. 5 is an enlarged cross-sectional view corresponding to one display area AG2 along the cutting line BB ′ in the second liquid crystal display panel 30 of FIG. As shown in FIG. 5, in the second liquid crystal display panel 30, an element substrate 31 and a color filter substrate 32 disposed to face the element substrate 31 are bonded together via a frame-shaped sealing material 3. A liquid crystal layer 4 is formed by sealing liquid crystal in a region partitioned by the sealing material 3.

  The second liquid crystal display panel 30 according to the present embodiment corresponds to a sub display panel for an electronic device such as a double-sided display mobile phone. The second liquid crystal display panel 30 is a transmissive liquid crystal display panel for color display configured using three colors of R, G, and B, and an α-Si TFT element as an example of a switching element. This is an active matrix liquid crystal display panel used.

  First, the configuration of the element substrate 31 will be described.

  The element substrate 31 includes a first substrate 72 mainly made of glass and the like, and a plurality of source lines 52, a plurality of gate lines 53, and a plurality of α-Si TFT elements formed or mounted on the first substrate 72. 57, a plurality of pixel electrodes 55, a driver IC 50, and an external connection wiring 55.

  As shown in FIG. 4, the element substrate 31 has an extended region 51 that extends outward from one side of the color filter substrate 32, and a driver IC 50 is mounted on the extended region 51. A terminal (not shown) on the input side of the driver IC 50 is electrically connected to one end side of the plurality of external connection wirings 55, and the other end side of the plurality of external connection wirings 55 is electrically connected to the FPC 59. It is connected. Each source line 52 is formed to extend in the Y direction at an appropriate interval in the X direction, and one end side of each source line 52 is electrically connected to a terminal (not shown) on the output side of the driver IC 50. It is connected.

  Each gate line 53 extends to the effective display region V2 side from the terminal portion of the first wiring 53a formed so as to extend in the Y direction and parallel to the X direction from the terminal portion of the first wiring 53a. The second wiring 53b is formed. The second wiring 53b of each gate line 53 is formed in a direction intersecting with each source line 52, and one end side of the first wiring 53a of each gate line 53 is an output side terminal (not shown) of the driver IC 50. Is electrically connected. An α-Si TFT element 57 is provided at a position corresponding to the intersection of each source line 52 and each gate line 53 with the second wiring 53b, and each α-Si TFT element 57 includes each source line 52 and each gate line 53. The gate line 53 and each pixel electrode 55 are electrically connected. Each α-Si TFT element 57 and each pixel electrode 55 are provided corresponding to each sub-pixel region SG. Each pixel electrode 55 is formed of a transparent conductive material such as ITO.

  A region in which a plurality of display regions AG2 are arranged in a matrix in the X direction and the Y direction is an effective display region V2 (a region surrounded by a two-dot chain line). In this effective display area V2, images such as letters, numbers, figures and the like are displayed. The area of the effective display area V2 of the second liquid crystal display panel 30 is smaller than the area of the effective display area V1 of the first liquid crystal display panel 20. The area outside the effective display area V2 is a frame area 58 that does not contribute to display. An alignment film (not shown) is formed on the inner surface of each source line 52, each gate line 53, each α-Si TFT element 57, each pixel electrode 55, and the like.

  Next, the configuration of the color filter substrate 32 will be described.

  The color filter substrate 32 includes a second substrate 73 mainly made of glass or the like, and three colors of BM and R (red), G (green), and B (blue) formed on the second substrate 73. It has layers 6R, 6G, 6B, a protective layer 9 formed on the BM and colored layers 6R, 6G, 6B, and a common electrode 8 formed on the protective layer 9.

  The BM is formed at a position that divides each sub-pixel region SG. Colored layers 6R, 6G, and 6B are formed at positions corresponding to the sub-pixel regions SG of the colors R, G, and B, respectively. The colored layers 6R, 6G, and 6B function as color filters for the respective colors. In the present invention, the arrangement order of the colored layers 6R, 6G, 6B in one display region AG2 is not limited. Similar to the pixel electrode 55, the common electrode 8 is made of a transparent conductive material such as ITO, and is formed over substantially the entire surface of the color filter substrate 32. The common electrode 8 is electrically connected to one end side of the wiring 56 in the corner area E2 of the sealing material 3, and the other end side of the wiring 56 is electrically connected to the COM terminal (grounding terminal) of the driver IC 50. Connected. An alignment film (not shown) is formed on the inner surface of the common electrode 8 or the like.

In the second liquid crystal display panel 30 having the above configuration, G ₁ , G ₂ ,... Are driven by the driver IC 50 based on signals and power from the FPC 59 side electrically connected to an electronic device described later. While the gate lines 53 are selected one by one in the order of G _m−1 and G _m (m is a natural number), a gate signal of a selection voltage is supplied to the selected gate lines 53, The other non-selected gate lines 53 are supplied with a gate signal of a non-selected voltage. Then, the driver IC 50 applies source signals corresponding to display contents to the pixel electrodes 55 existing at positions corresponding to the selected gate lines 53, respectively, corresponding to S ₁ , S _{2 ,. 1} , S _n (n is a natural number) source line 52 and α-Si type TFT element 57. As a result, the alignment state of the liquid crystal layer 4 is controlled, and the display state of the second liquid crystal display panel 30 is switched to the non-display state or the intermediate display state. Thereby, a desired image can be displayed in the effective display area V2.

  When the transmissive display is performed on the second liquid crystal display panel 30, the illumination light L3 emitted from the illumination device 1 side travels along the arrow direction in FIG. 5, and the pixel electrodes 10 and R, G, It passes through the three colored layers 6 of B and reaches the observation side. Thus, a desired color display image is visually recognized by the observer.

  As described above, in the first embodiment of the present invention, the liquid crystal device 100 is disposed on one surface side of the lighting device 1 including the light source unit 15 and the light guide plate 10, and R , B, G1, and G2 and the second liquid crystal panel 20 that is arranged on the other surface side of the lighting device 1 and that can express the three colors R, G, and B And a display panel 30.

  As a result, two display panels can be illuminated by one illumination device, and the cost and thickness of the electro-optical device can be reduced. Further, in the first liquid crystal display panel 20, a decrease in luminance of green light having high human visibility is suppressed, and display with a high color reproduction range can be performed. As a result, the first liquid crystal display panel 20 can be suitably used as a main display panel in an electronic device such as a double-sided display mobile phone. On the other hand, since the second liquid crystal display panel 30 is configured with three colors of R, G, and B, the color reproducibility is not so high as compared with the first liquid crystal display panel 20. Therefore, the second liquid crystal display panel 30 can be suitably used as a sub display panel that displays simple display information such as time, remaining battery level, and radio wave status in electronic devices such as a double-sided display type mobile phone. . Therefore, the liquid crystal device 100 of the first embodiment can be suitably used for electronic devices such as a double-sided display type mobile phone.

(Configuration of light source unit in lighting device)
Next, with reference to FIGS. 6A and 6B, the configuration and the like of the light source unit 15 in the illumination device 1 described above will be described. FIG. 6A shows a planar configuration of the lighting device 1. In FIG. 6A, the area surrounded by the alternate long and short dash line indicates the 20 effective display areas V1 of the first liquid crystal display panel, and the area surrounded by the broken line indicates the second liquid crystal display panel 30. The effective display area V2 is shown.

  As described above, the illuminating device 1 includes the light source unit 15 and the light guide plate 10, and in the light source unit 15, four LEDs 16 a to 16 d are provided at one end surface (light incident end surface 10 a) of the light source unit 15. ) At substantially equal intervals. In addition, the setting number and arrangement | positioning of LED16 shown to Fig.6 (a) are a mere illustration, and application of this invention is not limited to the aspect of illustration.

  Among the plurality of LEDs 16, the LEDs 16a and 16d are provided at positions where the LEDs 16b and 16c are sandwiched. The LED 16a and the LED 16d are each one LED, and semiconductor light emitting elements of each color of R (red), G (green), and B (blue) are incorporated in each of them. That is, although not shown, the LED 16a and the LED 16d have the same number of red LEDs that emit R (red) light, green LEDs that emit G (green) light, and blue LEDs that emit B (blue) light, respectively. It is configured as a single chip type LED (hereinafter also referred to as “RGBLED”). Therefore, the light emitted by each of the LED 16a and the LED 16d is white light Lrgb in which red light, green light, and blue light are mixed, and the LED 16a and the LED 16d are white in the direction of the light guide plate 10 as illustrated. Light Lrgb is emitted.

  On the other hand, among the plurality of LEDs 16, the remaining LEDs 16 b and LED 16 c are configured by a blue LED that emits blue light and a YAG (yttrium, aluminum, garnet) phosphor, although illustration is omitted. Here, the blue light emitted from the blue LED excites the YAG phosphor and generates yellow light. Therefore, the light emitted by each of the LED 16b and the LED 16c is white light in which blue light and yellow light generated by exciting the YAG phosphor with the blue light are mixed, and the LED 16b and the LED 16c are As illustrated, the white light Lyb is emitted in the direction of the light guide plate 10.

(Light source switching control circuit)
As described above, since the first liquid crystal display panel 20 includes the four colored layers 6R, 6B, 6G1, and 6G2 of R, B, G1, and G2, in an electronic device such as a double-sided display mobile phone, Whereas the second liquid crystal display panel 30 has three colored layers 6R, 6G, and 6B of R, G, and B, the second liquid crystal display panel 30 is used as a main display panel that requires a display with high color reproducibility. A display with high reproducibility is used as a sub display panel that is not so required.

  Therefore, when the first liquid crystal display panel 20 is used, if the first liquid crystal display panel 20 is illuminated by turning on at least the RGB LEDs, that is, the LEDs 16a and 16d, among the plurality of LEDs 16, red light emitted from the RGB LEDs. Light, green light, and blue light are transmitted through the four colored layers 6R, 6B, 6G1, and 6G2 of R, B, G1, and G2 in the first liquid crystal display panel 20, so that display with higher color reproducibility is achieved. Can be expected.

  On the other hand, when the second liquid crystal display panel 30 is used, the second liquid crystal display panel 30 is illuminated by turning on only the LED 16b and the LED 16c without using the RGBLED in consideration of the fact that the RGBLED easily changes over time. The following effects can be expected.

  That is, in the RGBLED, the spectrum (luminous intensity) of light emitted from the R, G, and B LEDs has a property of changing with time. Therefore, the white balance of the emitted light gradually collapses from the initial setting state, and naturally, the white balance at the time of display on the first liquid crystal display panel 20 also collapses. As a result, the first liquid crystal display panel 20 cannot be used as a main display panel that requires display with high color reproducibility. Therefore, when the second liquid crystal display panel 30 is used, the consumption of RGBLEDs due to changes over time is prevented as much as possible, and a good white balance at the time of initial setting of the first liquid crystal display panel 20 is maintained over a long period of time. In order to maintain, only the LED 16b and the LED 16c are turned on without using the RGB LEDs, and the second liquid crystal display panel 30 is illuminated by the lighting device 1. Thereby, the power saving of the light source unit 15 can be achieved while delaying the deterioration of RGBLED over time.

  FIG. 6B illustrates an example of a lighting switching control circuit of the light source unit that performs the lighting switching control of the four LEDs 16a to 16d described above.

  In this lighting switching control circuit, among the four LEDs 16a to 16d shown in FIG. 6 (b), the LED 16b and the LED 16c are connected in series, the LED 16a and the LED 16d are connected in series, and further, they are connected in parallel. Connected to the power supply Vcc and ground (GND). The parallel circuit and the power supply Vcc are connected, a switch SW1 is provided between the power supply Vcc and the LED 16b, and a switch SW2 is provided between the power supply Vcc and the LED 16a. Switching on / off of the switches SW1 and SW2 is performed by control signals Sc1 and Sc2 from the control unit 80.

  The control unit 80 receives a switching signal from the outside, and outputs control signals Sc1 and Sc2 accordingly. When the switching signal indicates a mode in which the first liquid crystal display panel 20 that is the main display panel is turned on (hereinafter referred to as “main display mode”), the control unit 80 turns on the switch SW2 and turns off the switch SW1. The control signals Sc1 and Sc2 are output as described above. As a result, current is supplied only to the LEDs 16a and 16d as RGB LEDs among the four LEDs 16, and the LEDs 16a and 16d emit light. As a result, white light Lrgb is emitted from each of the LEDs 16a and 16d toward the light guide plate 10 as shown in FIG. 6A. Based on the principle described above, the white light Lrgb shown in FIG. 1, FIG. 3, and FIG. The entire effective display area V1 of one liquid crystal display panel 20 is illuminated. Thereby, the red light, the green light, and the blue light emitted from the RGB LEDs pass through the four colored layers 6R, 6B, 6G1, and 6G2 of R, B, G1, and G2 in the first liquid crystal display panel 20. Thus, a display with higher color reproducibility can be obtained.

  However, the present invention is not limited to this. In the present invention, when power consumption or the like does not matter so much, when the switching signal indicates the main display mode, the control signal Sc1 is set so that the control unit 80 turns on both the switches SW1 and SW2. And Sc2 may be output. As a result, current is supplied to all four LEDs 16, and all the LEDs 16 a to 16 d emit light, and the luminance of the first liquid crystal display panel 20 can be improved.

  On the other hand, when the switching signal indicates a mode in which the second liquid crystal display panel 30 as the sub display panel is turned on (hereinafter referred to as “sub display mode”), the control unit 80 turns on the switch SW1 and switches the switch SW2. The control signals Sc1 and Sc2 are output so as to turn off. As a result, as shown in FIG. 6B, current is supplied only to the LEDs 16b and 16c, and the LEDs 16b and 16c emit light. As a result, white light Lyb is emitted from each of the LEDs 16b and 16c toward the light guide plate 10 as shown in FIG. 7A, and the first shown in FIGS. The entire effective display area V2 of the second liquid crystal display panel 30 is illuminated. In this way, in the sub display mode, the effective display region V2 of the second liquid crystal display panel 30 is illuminated only by the LEDs 16b and 16c without using the RGBLEDs, so that the consumption of the RGBLEDs due to the change with time is as much as possible. In addition to being able to prevent, good white balance at the time of initial setting of the first liquid crystal display panel 20 can be maintained for a long period of time.

  Note that the present invention is not limited to this, and in the present invention, as shown in FIG. 7B, one of the LEDs 16 b and 16 c (LED 16 e) is placed at a substantially central position of the light source unit 15 in the lighting device 1 a. When the switching signal indicates the sub display mode, the entire effective display area V2 of the second liquid crystal display panel 30 may be illuminated by emitting only one LED 16e.

  In addition, the switching signal designating either the main display mode or the sub display mode can be generated according to the design of an electronic device such as a mobile phone in which the liquid crystal device 100 of the first embodiment is mounted. Generally, in the case of a foldable mobile phone, only the first liquid crystal display panel 20 is illuminated when the display unit is opened and the main display panel is exposed, and when the display unit is closed, the sub display panel is the second display panel. Only the second liquid crystal display panel 30 is illuminated.

  This switching signal can be generated by an open / close detection mechanism or the like provided in a hinge or the like that connects the main body of the mobile phone and the display. In addition to switching between the main display mode and the sub display mode according to the open / closed state of the main unit and the display unit, for example, the display mode can be switched according to the operation of a specific button by the user, the main display panel or the sub display panel In some cases, the lighting device is automatically turned off after a predetermined time has elapsed since the start of lighting. In these cases, the control unit in the mobile phone or the like outputs a switching signal based on the operation of the operation button of the mobile phone by the user or the elapsed time. In the present invention, the method of generating the display mode switching signal is not limited to the above example, and can be applied to switching between the main display mode and the sub display mode according to various conditions.

(Other example 1 of an illuminating device)
Next, the configuration and the like of the other example 1 of the lighting device will be described. In the following, the same elements as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted or simplified.

  FIG. 8A is a plan view showing a configuration of a lighting device 1b according to another embodiment 1. FIG.

  In the illumination device 1 according to the first embodiment, the LEDs 16a and 16d as RGB LEDs are provided on both sides of the LEDs 16b and 16c, respectively. The LEDs 16a and 16d are a red LED that emits red light and a green LED that emits green light, respectively. , And a single-chip RGB LED having the same number of blue LEDs emitting blue light.

  On the other hand, in the lighting device 1b according to the second embodiment, the red LEDs 16dr and 16ar that emit red light, the green LEDs 16dg and 16ag that emit green light, and the blue light are provided on both sides of the LEDs 16b and 16c, respectively. Blue LEDs 16db and 16ab that emit light are provided. In the present invention, the arrangement order of the red LEDs 16dr and 16ar that emit red light, the green LEDs 16dg and 16ag that emit green light, and the blue LEDs 16db and 16ab that emit blue light is not particularly limited.

  According to such a configuration, the red LED 16dr, the green LED 16dg, and the blue LED 16db are caused to emit light, whereby the red light Lr, the green light Lg, and the blue light Lb are mixed and white light can be obtained. Similarly, by causing the red LED 16ar, the green LED 16ag, and the blue LED 16ab to emit light, the red light Lr, the green light Lg, and the blue light Lb are mixed and white light can be obtained.

  FIG. 8B illustrates the lighting switching of the light source unit according to the first embodiment of the lighting device that performs lighting switching control of the red LEDs 16dr and 16ar, the green LEDs 16dg and 16ag, the blue LEDs 16db and 16ab, and the LEDs 16b and 16c. An example of a control circuit is shown.

  The lighting switching control circuit of the light source unit is basically the same as the lighting switching control circuit of the light source unit according to the first embodiment, but both are different in the following points.

  That is, in another example 1, in the lighting switching control circuit of the light source unit according to the first embodiment, the LED 16a is replaced with a parallel circuit of a red LED 16dr, a green LED 16dg, and a blue LED 16db, and the switch SW2 A switch SW3 is provided between the red LED 16dr, a switch SW4 is provided between the switch SW2 and the green LED 16dg, and a switch SW5 is provided between the switch SW2 and the blue LED 16db. In the lighting switching control circuit of the light source unit according to the first embodiment, the LED 16d is replaced with a parallel circuit of a red LED 16ar, a green LED 16ag, and a blue LED 16ab, and the switch SW6 is further interposed between the switch SW2 and the red LED 16ar. The switch SW7 is provided between the switch SW2 and the green LED 16ag, and the switch SW8 is provided between the switch SW2 and the blue LED 16ab. Further, the control unit 80 receives a switching signal from the outside, and outputs control signals Sc3 to Sc8 in addition to the control signals Sc1 and Sc2 accordingly.

  In the above configuration, when the switching signal indicates the main display mode, the control unit 80 outputs the control signals Sc1 to Sc8 so as to turn on all the switches SW2 to SW8 and turn off the switch SW1. Accordingly, current is supplied only to the red LEDs 16dr and 16ar, the green LEDs 16dg and 16ag, and the blue LEDs 16db and 16ab, and white light is emitted from each of the LEDs. Thereby, the entire effective display area V1 of the first liquid crystal display panel 20 is illuminated, and a display with high color reproducibility can be obtained.

  However, the present invention is not limited to this. In the present invention, when power consumption or the like does not matter so much, when the switching signal indicates the main display mode, the control signal Sc1 is set so that the control unit 80 turns on all the switches SW1 to SW8. ~ Sc8 may be output. As a result, current is supplied to all of the red LEDs 16dr and 16ar, the green LEDs 16dg and 16ag, the blue LEDs 16db and 16ab, and the LEDs 16b and 16c, and each of the LEDs emits light, thereby obtaining a display with high color reproducibility. At the same time, the luminance of the first liquid crystal display panel 20 can be improved.

  On the other hand, when the switching signal indicates the sub display mode, the control unit 80 outputs the control signals Sc1 and Sc2 so as to turn on the switch SW1 and turn off the switch SW2. Thereby, the same effect as 1st Embodiment mentioned above can be acquired.

(Other example 2 of an illuminating device)
Next, the configuration and the like of another embodiment 2 of the lighting device will be described. In addition, below, the same code | symbol is attached | subjected about the same element as 1st Embodiment and the other Example 1 of an illuminating device, and the description is abbreviate | omitted or simplified.

  The configuration of the lighting device 1c and the lighting switching control circuit of the light source unit according to the second embodiment of the lighting device are the same as those of the first embodiment of the lighting device, respectively, but the switching signal indicates the sub display mode. In this case, the lighting switching control method of the light source unit is different.

  As described above, when the switching signal indicates the sub display mode, that is, in the mode in which the second liquid crystal display panel 30 is lit, the lighting switching control circuit causes only the LEDs 16b and 16c to emit light. The light that illuminates the display panel 30 becomes white light with a large amount of blue light components. That is, the light that illuminates the second liquid crystal display panel 30 may be bluish white light.

  Therefore, in order to prevent the occurrence of such a problem, in the second embodiment, in the lighting switching control circuit of FIG. 8B, in the mode in which the second liquid crystal display panel 30 is turned on, the control unit 80 Only the blue LEDs 16db and 16ab emitting blue light are turned off and all other LEDs are turned on. Specifically, in this case, the control unit 80 outputs the control signals Sc1 to Sc4, Sc6, and Sc7 so as to turn on the switches SW1 to SW4, SW6, and SW7 in the lighting switching control circuit of FIG. At the same time, control signals Sc5 and Sc8 are output so as to turn off the switches SW5 and SW8. Accordingly, as shown in FIG. 9A, red light Lr is emitted from each of the red LEDs 16dr and 16ar, green light Lg is emitted from each of the green LEDs 16dg and 16ag, and each of the LEDs 16b and 16c is emitted. The white light Lyb with a large amount of blue light component is emitted from the light source, and each of these lights is mixed, and the mixed white light approaches pure white light, that is, the LEDs 16b and 16c are mixed with red light and green light. The light is corrected to white light with less coloring. As a result, the illuminating device 1c can illuminate the second liquid crystal display panel 30 using white light having no color.

  Since the green light emitted by the green LEDs 16dg and 16ag is bright, it has a role of increasing the overall luminance of the illumination light, and among the red LEDs 16dr and 16ar, the green LEDs 16dg and 16ag, and the blue LEDs 16db and 16ab, the red LED 16dr. And 16ar have the property of the fastest deterioration over time. Therefore, in consideration of this point, in the lighting switching control circuit of FIG. 8B, in the mode for lighting the second liquid crystal display panel 30, the control unit 80 adds the blue LEDs 16db and 16ab that emit blue light. It is preferable to turn off the red LEDs 16dr and 16ar that emit red light and turn on all other LEDs. That is, in this case, in the lighting device 1c, as shown in FIG. 9B, green light Lg is emitted from each of the green LEDs 16dg and 16ag, and white light having a large amount of blue light from each of the LEDs 16b and 16c. Lyb is emitted, each of the lights is mixed, and the mixed white light is corrected to white light with less coloring. In addition, this can delay the deterioration of the red LEDs 16dr and 16ar over time, and can increase the luminance of the illumination light that illuminates the second liquid crystal display panel 30.

(Other example 3 of an illuminating device)
Next, the configuration and the like of another embodiment 3 of the lighting device will be described. In the following description, the same elements as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted or simplified.

  FIG. 10A is a plan view of a lighting device 1d according to another third embodiment. As illustrated, the lighting device 1 d includes two LEDs 16 rgb and 16 yb in the light source unit 15. The two LEDs 16 rgb and 16 yb are respectively provided at positions at both ends on the one end face (light incident end face 10 a) side of the light guide plate 1. Here, the LED 16rgb is a single-chip type RGB LED that generates white light, and the LED 16yb is an LED that includes a blue LED that emits blue light and a YAG-based phosphor, and generates white light. In the main display mode, both the two LEDs 16 rgb and 16 yb are turned on or only the LED 16 rgb is turned on to illuminate the first liquid crystal display panel 20 that is the main display panel. On the other hand, in the sub display mode, only one of the two LEDs 16rgb and 16yb is turned on (in FIG. 10A, the LED 16yb is turned on as an example), and the sub display panel is formed only by the emitted light. The second liquid crystal display panel 30 is illuminated. Accordingly, in the sub display mode, any one of the two LEDs 16rgb and 16yb is turned off, so that power consumption can be reduced.

  Note that if only one LED is always lit in the sub display mode, only that LED will be consumed. Therefore, each time the mode is changed to the sub display mode, a different side from the LED used immediately before. The LED may be turned on. That is, only the LED 16rgb is lit in the first sub display mode, only the LED 16yb is lit in the second sub display mode, and only the LED 16rgb is lit again in the third sub display mode. An LED may be selected.

  In the lighting device 1d, as the lighting switching control circuit of the light source unit, a switch is provided in series in one or both of the two LEDs 16rgb and 16yb, and only one LED is lit. What is necessary is just to make it the control part 80 switch the case where it lights up. For example, as the lighting switching control circuit of the light source unit, as shown in FIG. 10B, the LED 16rgb and the LED 16yb are connected in parallel, the parallel connection circuit is connected to the power source Vcc, and the switch SW1 is connected to the LED 16yb side. Further, by providing the switch SW2 on the LED 16rgb side, the control unit 80 can be configured to switch between the case where two LEDs are lit and the case where only one LED is lit.

(Other example 4 of an illuminating device)
Next, the configuration and the like of another embodiment 4 of the lighting device will be described. In the following description, the same elements as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted or simplified.

  Fig.11 (a) shows the top view of the illuminating device 1e which concerns on other Example 4. FIG.

  As illustrated, in addition to the configuration of the illumination device 1 illustrated in FIG. 6A, the illumination device 1 e includes an auxiliary light source unit 15 x having one LED 16 f that functions as an auxiliary light source on the side facing the light source unit 15. Is provided. Here, the LED 16f is an LED that is configured by a blue LED that emits blue light and a YAG-based phosphor, and generates white light. Thus, by providing the LED 16f as an auxiliary light source, the brightness of the second liquid crystal display panel 30 in the sub display mode can be increased. Note that the number of auxiliary light sources set may be one or more. That is, as a sub display mode, a normal brightness sub display mode (hereinafter referred to as “normal sub display mode”) and a sub display mode brighter than normal (hereinafter referred to as “high luminance sub display mode”). ) Can be realized.

  That is, in the normal sub display mode, as shown in FIG. 7A, the two LEDs 16b and 16c in the light source unit 15 are turned on to illuminate the second liquid crystal display panel 30 as the sub display panel. . On the other hand, in the high-luminance sub display mode, as shown in FIG. 11A, in addition to the LEDs 16b and 16c, the LED 16f as an auxiliary light source is lit to turn on the second liquid crystal display panel 30 as a sub display panel. Illuminate. Thereby, in the high luminance sub display mode, the second liquid crystal display panel 30 as the sub display panel can be brightened by the amount of the LED 16f that is the auxiliary light source.

  Therefore, when it is desired to display the sub display mode brightly for some reason, an electronic device such as a mobile phone can be configured to display in the high luminance sub table mode. For example, when the sub display mode is automatically selected in accordance with the opening / closing operation of the folding cellular phone, the second liquid crystal display panel 30 as the sub display panel is illuminated with the two LEDs 16b and 16c as the normal sub display mode. When the user consciously selects a sub display mode by operating a specific button or the like, a bright display can be performed with the three LEDs 16b, 16c, and 16f as the high luminance sub display mode.

  In the present invention, the LED 16f, which is an auxiliary light source, may be lit as necessary even in the main display mode. Moreover, in this invention, as shown in FIG.7 (b), either one LED16e is provided in the substantially center position of the light source part 15 among LED16b and 16c in the illuminating device 1a, and a switching signal is sub display mode. In this case, only one LED 16e is caused to emit light to illuminate the entire effective display area V2 of the second liquid crystal display panel 30, but this configuration is also shown in FIG. As described above, the auxiliary light source unit 15x having one LED 16f functioning as an auxiliary light source may be provided on the side facing the light source unit 15 to obtain the above-described effects.

  As the lighting switching control circuit in the lighting device 1f, in the lighting control circuit shown in FIG. 6B, the LED 16f is further connected to the series connection of the LEDs 16b and 16c and the series connection of the LEDs 16a and 16d. What is necessary is just to connect in parallel and control lighting of LED16f by the control part 80.

[Second Embodiment]
Next, the configuration and the like of the liquid crystal device according to the second embodiment of the present invention will be described. FIG. 12 shows a configuration of a liquid crystal device according to the second embodiment of the present invention.

  The liquid crystal device 200 according to the second embodiment is different from the configuration of the liquid crystal device 100 according to the first embodiment in that a transflective sheet 81 is provided between the lighting device 1 and the diffusion sheet 17. The point is that both configurations are the same. Therefore, the same elements as those of the liquid crystal device 100 of the first embodiment are denoted by the same reference numerals, and the description thereof is simplified or omitted.

  As illustrated, the transflective sheet 81 is provided between the light guide plate 10 and the diffusion sheet 17. The transflective sheet 81 has a property of transmitting a predetermined proportion of the received light and reflecting the remaining light. Therefore, a predetermined ratio of the light emitted from the second light exit surface 10c of the light guide plate 10 is irradiated as the light L3 to the second liquid crystal display panel 30 side as the sub display panel, and the remaining light is transmitted by the transflective sheet 81. The light is reflected and irradiated to the first liquid crystal display panel 20 side as the main display panel as light L4. In the state where there is no transflective sheet 81, the light incident on the light guide plate 10 from the light source unit 15 is applied to the first liquid crystal display panel 20 and the second liquid crystal display panel 30 at substantially the same rate. However, by providing the transflective sheet 81, a part of the light emitted from the light guide plate 10 to the second liquid crystal display panel 30 side is reflected by the transflective sheet 81 and irradiated to the first liquid crystal display panel 20. Is done. Thereby, it becomes possible to illuminate the first liquid crystal display panel 20 as the main display panel more brightly using the same lighting device 1. However, the brightness of the second liquid crystal display panel 30 that is the sub display panel is reduced accordingly. In addition, in 2nd Embodiment, it is the same as that of 1st Embodiment except said point, and can obtain the same effect as the said 1st Embodiment.

[Third embodiment]
Next, the configuration and the like of the liquid crystal device according to the third embodiment of the invention will be described. FIG. 13 shows a configuration of a liquid crystal device according to the third embodiment of the present invention.

  The liquid crystal device 300 according to the third embodiment is substantially the same as the liquid crystal device 100 according to the first embodiment, but the third embodiment is structurally different from the liquid crystal device 100 according to the first embodiment in the following points. To do. Therefore, the same elements as those of the liquid crystal device 100 of the first embodiment are denoted by the same reference numerals, and the description thereof is simplified or omitted.

  That is, in the third embodiment, the diffusion sheet 11, the first prism sheet 12, and the second prism sheet 13 are provided between the light shielding sheet 14 on the first liquid crystal display panel 20 side and the lighting device 1. Instead, one prism sheet 89 is provided between the light shielding sheet 14 on the first liquid crystal display panel 20 side and the lighting device 1. Further, the diffusion sheet 17, the first prism sheet 18 and the second prism sheet 19 are not provided between the light-shielding sheet 14 on the second liquid crystal display panel 30 side and the lighting device 1, but instead. A single prism sheet 88 is provided between the light shielding sheet 14 on the second liquid crystal display panel 30 side and the lighting device 1.

  Here, each of the prism sheets 88 and 89 has a plurality of prisms 88x and 89x having a triangular cross section on the side facing the illumination device 1, and each prism 88x and 89x extends in the Y direction. Have.

  Since the liquid crystal device 300 according to the third embodiment having the above configuration has fewer components than the first embodiment, the liquid crystal device 300 can be reduced in thickness by that amount. Therefore, by applying the liquid crystal device 300 according to the third embodiment to an electronic device such as a double-sided display mobile phone, it is possible to contribute to thinning of the electronic device. Note that the third embodiment is the same as the first embodiment except for the points described above, and can obtain the same functions and effects as those of the first embodiment.

[Other Embodiments]
In the above description, the first liquid crystal display panel 20 has been described by taking an example of the four colored regions of R, B, G1, and G2 as the colored regions of four colors. Is not limited, and one pixel region can be constituted by other four colored regions.

  In this case, the four-color colored region is a blue-colored colored region (also referred to as a “first colored region”) or a red-based color in a visible light region (380 to 780 nm) whose hue changes according to the wavelength. Colored areas (also referred to as “second colored areas”) and two colored areas selected from hues from blue to yellow (“third colored areas”, “fourth colored areas”) "). Here, the term “system” is used. For example, if it is a blue system, the color is not limited to a pure blue hue, and includes a blue-violet color, a blue-green color, and the like. If it is a red hue, it is not limited to red but includes orange. These colored regions may be composed of a single colored layer, or may be composed of a plurality of colored layers having different hues. In addition, although these colored regions are described in terms of hue, the hue can be set by changing the saturation and lightness as appropriate.

The specific hue range is
-The colored region of the blue hue is from violet to blue-green, more preferably from indigo to blue.
-The colored region of red hue is from orange to red.
-One coloring area | region selected by the hue from blue to yellow is blue to green, More preferably, it is blue green to green.
-The other coloring area | region selected by the hue from blue to yellow is green to orange, More preferably, it is green to yellow. Or it is green to yellowish green.

  Here, the same hue is not used for each colored region. For example, when a green hue is used in two colored regions selected from hues of blue to yellow, the other uses a blue or yellowish green hue for one green.

  Thereby, a wider range of color reproducibility than the conventional RGB colored region can be realized.

In the above description, a wide range of color reproducibility by the colored areas of four hues has been described in terms of hue, but as another specific example, it is expressed as follows when expressed in terms of wavelengths that pass through the colored areas.
The blue colored region is a colored region having a peak of the wavelength of light transmitted through the colored region at 415 to 500 nm, preferably a colored region at 435 to 485 nm.
The red colored region is a colored region having a wavelength peak of light transmitted through the colored region of 600 nm or more, and preferably a colored region of 605 nm or more.
One colored region selected with a hue from blue to yellow is a colored region having a wavelength peak of light of 485 to 535 nm, preferably 495 to 520 nm. .
The other colored region selected with a hue from blue to yellow is a colored region having a wavelength peak of light of 500 to 590 nm transmitted through the colored region, preferably a colored region having a wavelength of 510 to 585 nm, or 530 to This is a colored region at 565 nm.

  In the case of transmissive display, this wavelength is a numerical value obtained by illuminating light from the illumination device through the color filter. In the case of reflective display, the value is obtained by reflecting external light.

Furthermore, as another specific example, a colored region of four hues is expressed by an xy chromaticity diagram as follows.
The blue colored region is a colored region where x ≦ 0.151 and y ≦ 0.200, preferably a colored region where 0.134 ≦ x ≦ 0.151 and 0.034 ≦ y ≦ 0.200.
The red colored region is a colored region satisfying 0.520 ≦ x and y ≦ 0.360, and preferably a colored region satisfying 0.550 ≦ x ≦ 0.690 and 0.210 ≦ y ≦ 0.360.
-One of the colored areas selected in hues from blue to yellow is a colored area where x ≦ 0.200 and 0.210 ≦ y, preferably a colored area where 0.080 ≦ x ≦ 0.200 and 0.210 ≦ y ≦ 0.759 is there.
-The other colored region selected with a hue from blue to yellow is a colored region in the range of 0.257 ≦ x, 0.450 ≦ y, preferably a colored region in the range of 0.257 ≦ x ≦ 0.520, 0.450 ≦ y ≦ 0.720 is there.

  This xy chromaticity diagram is a numerical value obtained when illumination light from the illumination device is obtained through a color filter in the case of transmissive display. In the case of reflective display, the value is obtained by reflecting external light.

  These four colored areas can be applied within the above-described range when the sub-pixel includes a transmission area and a reflection area.

  In addition, when the coloring area | region of the hue of four colors in this example is used, as above-mentioned, as a backlight (illuminating device), LED (Light Emitting Diode) as a RGB light source, a fluorescent tube, organic EL (organic) electroluminescence) or the like may be used. Alternatively, a white light source may be used. The white light source may be a white light source generated by the blue light emitter and the YAG phosphor as described above.

However, the following are preferable as the RGB light source.
-B has a peak wavelength of emitted light at 435 nm to 485 nm-G has a peak wavelength of emitted light at 520 nm to 545 nm-R has a peak wavelength of emitted light at 610 nm to 650 nm Further, a wider range of color reproducibility can be obtained if the above-described colored layer is appropriately selected according to the wavelength of the RGB light source. Moreover, you may use the light source which has a some peak so that a wavelength may come to a peak at 450 nm and 565 nm, for example.

Specific examples of the configuration of the colored region of the above four hues include the following.
-Colored areas with hues of red, blue, green, and cyan (blue-green).
・ Colored areas of red, blue, green and yellow ・ Colored areas of red, blue, dark green and yellow ・ Colored areas of red, blue, emerald green and yellowish green ・ Hue is red, Blue, emerald green, yellow colored areas / colored areas of red, blue, dark green, yellowish green
[Modification]
In the various embodiments described above, the first liquid crystal display panel 20 that functions as the main display panel is formed as a large panel, while the second liquid crystal display panel 30 that functions as the sub display panel is the first liquid crystal display panel. It is formed as a small panel smaller than the liquid crystal display panel 20. However, in the present invention, the relative size relationship between the first liquid crystal display panel 20 and the second liquid crystal display panel 30 is not particularly limited. Therefore, in the present invention, the relative sizes of the first liquid crystal display panel 20 and the second liquid crystal display panel 30 may be the same, or the second liquid crystal display panel 30 may be the first liquid crystal display panel 20. It can be larger.

  In the various embodiments described above, the second liquid crystal display panel 30 is configured as a liquid crystal display panel having the colored layers 6 of three colors R, G, and B. However, the present invention is not limited to this. Then, like the first liquid crystal display panel 20, the second liquid crystal display panel 30 may be configured as a liquid crystal display panel having four colored layers 6 of R, B, G1, and G2.

  Further, in the various embodiments described above, the first liquid crystal display panel 20 and the second liquid crystal display panel 30 are configured as a completely transmissive liquid crystal display panel, but in the present invention, instead of this, The first liquid crystal display panel 20 and the second liquid crystal display panel 30 may be configured as a transflective liquid crystal display panel.

  Further, in the first liquid crystal display panel 20 and the second liquid crystal display panel 30 described above, α-Si TFT elements 47 and 57 are used as switching elements, respectively. For the first liquid crystal display panel 20 and the second liquid crystal display panel 30, other three-terminal type elements such as polysilicon TFTs and two-terminal type non-linear elements represented by TFD (Thin Film Diode) elements are used. It can also be applied.

  In addition, various modifications can be made in the present invention without departing from the spirit of the present invention.

[Electronics]
Next, with reference to FIGS. 14 and 15, an embodiment of an electronic apparatus including the liquid crystal device 100, 200, or 300 having the above-described various illumination devices will be described. As shown in FIG. 14, the electronic apparatus according to this embodiment includes a control unit 1100 that controls the first liquid crystal display panel 20 and a control unit 1300 that controls the second liquid crystal display panel 30. The control means 1100 and 1300 are controlled by a central control unit 1000 constituted by a microcomputer or the like installed in the electronic device.

  The first liquid crystal display panel 20 and the second liquid crystal display panel 30 are mounted on the panel or connected to the panel via a wiring member, etc., and a drive circuit 110D configured with a semiconductor IC or the like. , 130D, and these drive circuits 110D, 130D are connected to the control means 1100, 1300. The control means 1100, 1300 includes display information output sources 1110, 1310, display processing circuits 1120, 1320, power supply circuits 1130, 1330, and timing generators 1140, 1340.

  The display information output sources 1110 and 1310 are a memory composed of a ROM (Read Only Memory), a RAM (Random Access Memory), etc., a storage unit composed of a magnetic recording disk, an optical recording disk, etc., and a tuned output that tunes and outputs digital image signals. And display information is supplied to the display information processing circuits 1120 and 1320 in the form of image signals in a predetermined format based on various clock signals generated by the timing generators 1140 and 1340. .

  The display information processing circuits 1120 and 1320 include various known circuits such as a serial-parallel conversion circuit, an amplification / inversion circuit, a rotation circuit, a gamma correction circuit, and a clamp circuit, and execute processing of input display information. Image information is supplied to the drive circuit together with the clock signal CLK. The drive circuits 110D and 130D include a scanning line drive circuit, a data line drive circuit, and an inspection circuit. The power supply circuits 1130 and 1330 supply predetermined voltages to the above-described components.

  The central control unit 1000 appropriately sends on / off commands, original data of display information, and the like to the display information output sources 1110 and 1310 of the control means 1100 and 1300, and displays display information corresponding thereto as a display information output source 1110. , 1310, and appropriate display images are displayed on the first liquid crystal display panel 20 and the second liquid crystal display panel 30 via the control means 1100, 1300 and the drive circuits 110D, 130D. The central control unit 1000 is configured to control the light source unit 15 such as turning on and off.

  FIG. 15 shows a mobile phone 2000 which is an embodiment of an electronic apparatus according to the invention. The cellular phone 2000 includes a main body 2001 having various operation buttons and a built-in microphone, and a display unit 2002 having a display screen and an antenna and a built-in speaker. The main body 2001 and the display 2002 are mutually connected. It is configured to be foldable. In the cellular phone 2000, for example, when the main body 2001 and the display unit 2002 are folded, the first liquid crystal display panel 20 is positioned on the surface of the display unit 2002 on the main body 2001 side, and the second liquid crystal display panel 30 is displayed. Is located on the surface of the display portion 2002 opposite to the main body portion 2001. The display unit 2002 incorporates the liquid crystal device 100, 200, or 300 having the above-described various illumination devices, and the display screen of the first liquid crystal display panel 20 on the main side is visible on the inner surface. Further, the display screen of the second liquid crystal display panel 30 on the sub side is configured to be visible on the outer surface.

  In the present embodiment, as shown in FIG. 15A, by opening the display unit 2002 from the main body unit 2001, the first liquid crystal display panel 20 on the main side is turned on in response to a command from the central control unit 1000, and a predetermined number Is displayed. Further, as shown in FIG. 15B, by folding the display unit 2002 onto the main body unit 2001, the first liquid crystal display panel 20 on the main side is turned off, and instead, the second liquid crystal display panel 30 on the sub side is turned off. It can be configured so that a predetermined image is displayed by lighting up.

  It should be noted that the electro-optical device and the electronic apparatus of the present invention are not limited to the illustrated examples described above, and various changes can be made without departing from the scope of the present invention. For example, in each of the above embodiments, a liquid crystal display panel is used as the electro-optical panel, but various electro-optical panels such as an organic electroluminescence panel, a plasma display panel, and a field emission display are used as the electro-optical panel of the present invention. You can also.

1 is a cross-sectional view illustrating a schematic configuration of a liquid crystal device according to a first embodiment of the present invention. FIG. 2 is a plan view of the first liquid crystal display panel shown in FIG. 1. FIG. 3 is a cross-sectional view of a first liquid crystal display panel taken along a cutting line AA ′ in FIG. 2. The top view of the 2nd liquid crystal display panel shown in FIG. FIG. 5 is a cross-sectional view of a second liquid crystal display panel taken along a cutting line BB ′ in FIG. 4. The structure of the illuminating device shown in FIG. 1 and the lighting control circuit example are shown. The top view of the illuminating device which shows the lighting control example of a 2nd liquid crystal display panel. The structure of the illuminating device based on another Example 1 and the example of a lighting control circuit are shown. The structure of the illuminating device based on other Example 2, and the example of a lighting control circuit are shown. The structure of the illuminating device based on other Example 3, and the lighting control circuit example are shown. The structure etc. of the illuminating device based on other Example 4 are shown. Sectional drawing which shows schematic structure of the liquid crystal device which concerns on 2nd Embodiment of this invention. Sectional drawing which shows schematic structure of the liquid crystal device which concerns on 3rd Embodiment of this invention. FIG. 11 is a block diagram illustrating a configuration example of an electronic device. The perspective view which shows the external appearance of the mobile telephone which is an example of an electronic device.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1, 1a, 1b, 1c, 1e, 1f Illuminating device, 6 colored layer, 10 light guide plate, 15 light source part, 16 LED, 20 1st liquid crystal display panel, 30 2nd liquid crystal display panel, 80 control part, 100 , 200, 300 Liquid crystal device, 2000 Mobile phone

Claims (9)

A lighting device having a light guide plate and a plurality of light sources, wherein the first light source of the plurality of light sources can be controlled to be turned on independently of the second light source;
A first display panel having a first color filter disposed on one surface side of the illumination device and including a colored region of at least four hues in the first unit pixel;
A second display panel having a second color filter disposed on the other surface side of the lighting device and including a colored region of at least three hues in the second unit pixel;
The electro-optical device is characterized in that the first light source is not turned on when illuminating the second display panel. The plurality of light sources emit white light,
The first light source includes a first semiconductor light emitting element that emits red light, a second semiconductor light emitting element that emits green light, and a third semiconductor light emitting element that emits blue light.
The second light source includes a fourth semiconductor light emitting element that emits blue light and a phosphor that emits yellow light when irradiated with the blue light emitted from the fourth semiconductor light emitting element. The electro-optical device according to claim 1.   The lighting device includes a control unit that controls lighting of the light source in a first mode in which all of the plurality of light sources are turned on and a second mode in which only the second light source is turned on. Item 3. The electro-optical device according to Item 1 or 2.   The control unit performs lighting control of the light source in the first mode when illuminating the first display panel, and controls the light source in the second mode when illuminating the second display panel. The electro-optical device according to claim 3, wherein lighting control is performed. The plurality of light sources includes an auxiliary light source disposed on the other end surface facing the one end surface of the light guide plate in which the plurality of light source units are disposed,
The electro-optical device according to claim 3, wherein the control unit has a third mode in which only the second light source and the auxiliary light source are turned on.   The first color filter is selected from a blue-based hue coloring region, a red-based hue coloring region, and a hue from blue to yellow among visible light regions whose hue changes according to a wavelength. The electro-optical device according to claim 1, wherein the electro-optical device has colored regions of two kinds of hues.   The first color filter includes a first colored region having a wavelength peak of light transmitted through the colored region of 415 to 500 nm, a second colored region of 600 nm or more, and a third colored region of 485 to 535 nm. The electro-optical device according to claim 1, further comprising: a fourth colored region having a wavelength of 500 to 590 nm.   An electronic apparatus comprising the electro-optical device according to claim 1 in a display unit. The electronic device is a foldable mobile phone including a main body and the display,
When the main body portion and the display portion are folded, the first display panel is positioned on the surface of the display portion on the main body portion side, and the second display panel is opposite to the main body portion of the display portion. The electronic device according to claim 8, wherein the electronic device is located on a side surface.

Images